[BlobAsync] Moving async handling into BlobStorageContext & quota out.

storage/common/blob_storage/blob_storage_constants.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "storage/common/blob_storage/blob_storage_constants.h"
 
 #include "base/logging.h"
 
 namespace storage {
 
 bool BlobStatusIsError(BlobStatus status) {
   return static_cast<int>(status) <= static_cast<int>(BlobStatus::LAST_ERROR);
 }
 
+bool BlobStatusIsPending(BlobStatus status) {
+  int status_int = static_cast<int>(status);
+  return status_int >= static_cast<int>(BlobStatus::PENDING_QUOTA) &&
+         status_int <= static_cast<int>(BlobStatus::PENDING_INTERNALS);
+}
+
 bool BlobStatusIsBadIPC(BlobStatus status) {
   return status == BlobStatus::ERR_INVALID_CONSTRUCTION_ARGUMENTS;
 }
 
 }  // namespace storage